<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>修改商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert
        title="修改商品信息"
        type="info"
        center
        show-icon
        :closable="false"
      >
      </el-alert>
      <!-- 步骤条区域 -->
      <el-steps
        :space="200"
        :active="activeIndex - 0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- Tab栏区域 -->
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
        label-position="top"
      >
        <el-tabs
          :tab-position="'left'"
          v-model="activeIndex"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="editForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="editForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input
                v-model="editForm.goods_weight"
                type="number"
              ></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input
                v-model="editForm.goods_number"
                type="number"
              ></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <!-- 级联选择器 -->
              <el-cascader
                v-model="editForm.goods_cat"
                :options="catelist"
                :props="{
                  expandTrigger: 'hover',
                  label: 'cat_name',
                  value: 'cat_id',
                  children: 'children',
                }"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的item项 -->
            <el-form-item
              :label="item.attr_name"
              v-for="item in manyTableData"
              :key="item.attr_id"
            >
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  :label="cb"
                  v-for="(cb, i) in item.attr_vals"
                  :key="i"
                  border
                >
                </el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item
              :label="item.attr_name"
              v-for="item in onlyTableData"
              :key="item.attr_id"
            >
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action表示图片上传到后台的地址 -->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess"
            >
              <el-button size="small" type="primary">点击上传</el-button>
              <div slot="tip" class="el-upload__tip">
                只能上传jpg/png文件，且不超过500kb
              </div>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="editForm.goods_introduce"></quill-editor>
            <!-- 添加商品按钮 -->
            <el-button type="primary" class="btnEdit" @click="Edit"
              >提交修改</el-button
            >
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt="" class="previewImg" />
    </el-dialog>
  </div>
</template>
<script>
import _ from 'lodash'
export default {
  data() {
    return {
      //当前商品的id
      id: '',
      //当前激活的步骤
      activeIndex: '0',
      //修改商品的表单数据对象
      editForm: {
        //商品名称
        goods_name: '',
        //商品价格
        goods_price: '',
        //商品重量
        goods_weight: '',
        //商品数量
        goods_number: '',
        //商品所属的分类数组
        goods_cat: [],
        //图片的数组
        pics: [],
        //商品的详情描述
        goods_introduce: '',
        //处理后的动态参数和静态属性数组
        attrs: [],
      },
      //修改商品的数据规则对象
      editFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' },
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' },
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' },
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' },
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' },
        ],
      },
      //商品分类列表
      catelist: [],
      //动态参数列表的数据
      manyTableData: [],
      //静态属性列表的数据
      onlyTableData: [],
      //上传图片的url地址
      // uploadURL: 'https://www.aerowang.cn/api/private/v1/upload',
      // uploadURL: 'https://www.liulongbin.top:8888/api/private/v1/upload',
      uploadURL: 'http://timemeetyou.com:8889/api/private/v1//upload',
      // 图片上传组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token'),
      },
      //预览图片的Url
      previewPath: '',
      //控制预览图片对话框的显示与隐藏
      previewVisible: false,
    }
  },
  created() {
    this.getListById()
    this.getCateList()
  },
  methods: {
    async getListById() {
      const id = window.location.href.substr(
        window.location.href.lastIndexOf('/') + 1,
        window.location.href.length
      )
      this.id = id
      //   console.log(id)
      //   获取到当前的商品的id，发起请求
      const { data: res } = await this.$http.get(`goods/${id}`)
      if (res.meta.status !== 200) {
        return this.$message.error('获取当前商品信息失败！')
      }
      // 将goods_cat ,分隔的字符串转化为数组 并将数组中的字符串转化成数字类型

      res.data.goods_cat = res.data.goods_cat.split(',').map(Number)
      this.editForm = res.data
      // console.log(this.editForm.goods_cat)
    },
    //获取商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类数据失败！')
      }
      this.catelist = res.data
      // console.log(this.catelist)
    },
    //监听级联选择器选择项变化的事件
    handleChange() {
      //只允许选择级联三级菜单
      if (this.editForm.goods_cat.length !== 3) {
        this.editForm.goods_cat = []
      }
      console.log(this.editForm.goods_cat)
    },
    //Tab栏标签页切换的回调函数
    beforeTabLeave(activeName, oldActiveName) {
      if (oldActiveName === '0' && this.editForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类！')
        return false
      }
    },
    //Tab栏被选中时触发的函数
    async tabClicked() {
      if (this.activeIndex === '1') {
        //访问的是动态参数面板时发起请求
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'many' },
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数列表失败！')
        }
        //将attr_vals空格分隔的字符串转化为数组
        res.data.forEach((item) => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        })
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        //访问的是静态属性面板时发起请求
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'only' },
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性列表失败！')
        }
        this.onlyTableData = res.data
      }
    },
    //处理图片预览效果
    handlePreview(file) {
      console.log(file)
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    //处理移除图片的操作
    handleRemove(file) {
      // 1.获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2.从pics数组中找到该图片对应的索引值
      const i = this.editForm.pics.findIndex((x) => x.pic === filePath)
      // 3.将图片信息用splice方法从pics数组中移除
      this.editForm.pics.splice(i, 1)
    },
    //监听图片上传成功的事件
    handleSuccess(response) {
      // console.log(response)
      //  1.拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      //  2.将图片信息对象 push到pics数组中
      this.editForm.pics.push(picInfo)
    },
    //添加商品
    Edit() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项')
        }
        //执行添加
        //通过lodash cloneDeep 深拷贝，将goods_cat转化为字符串
        const form = _.cloneDeep(this.editForm)
        form.goods_cat = form.goods_cat.join(',')
        //处理动态参数
        this.manyTableData.forEach((item) => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' '),
          }
          this.editForm.attrs.push(newInfo)
        })
        //处理静态属性
        this.onlyTableData.forEach((item) => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals,
          }
          this.editForm.attrs.push(newInfo)
        })
        form.attrs = this.editForm.attrs
        //发起请求 完成修改商品
        //商品的名称必须是唯一的
        const { data: res } = await this.$http.put(`goods/${this.id}`, form)
        if (res.meta.status !== 200) {
          return this.$message.error('修改商品失败！')
        }
        this.$message.success('修改商品成功！')
        //添加成功，跳转到商品列表页面
        this.$router.push('/goods')
      })
    },
  },
  computed: {
    //三级分类的id
    cateId() {
      if (this.editForm.goods_cat.length === 3) {
        return this.editForm.goods_cat[2]
      }
      return null
    },
  },
}
</script>
<style lang="less" scoped>
.el-checkbox {
  margin-right: 10px;
}
.previewImg {
  width: 100%;
}
.btnEdit {
  margin-top: 15px;
}
</style>
